M2 Antenna Systems 6-30LP11 User manual

M2 Antenna Systems, Inc. 4402 N. Selland Ave. Fresno, CA 93722

Tel: (559) 432-8873 Fax: (559) 432-3059 Web: www.m2inc.com

Rev.01

Model .........................................6-30LP11

Frequency Range.......................6 To 30 MHz

*Gain ..........................................5 To 6.2 dBi

Front to back ..............................10 To 20 dB Typical

Feed Impedance........................50 Ohms Unbalanced

Maximum VSWR........................1.8:1 Max, Under 1.5

Input Connector..........................“N” Female

Power Handling..........................3 Kw, Higher Optional

Boom Length / Type...................80’ / Steel Tower

Turning Radius:..........................65’

Wind area / Survival...................125 MPH

Weight / Ship Wt.........................1,228 Lbs.

M2 Antenna Systems, Inc.

Model No: 6-30LP11

FEATURES:

The 6-30lp11 log periodic is a modern design both mechanically and electrically. Top quality materials combined

with many CNC machined parts will keep it trouble free for years or operation. Performance is excellent and specific path

gain can be as much as 12 dB with ground gain factored in. The 6-30LP11 is available individually or in a turnkey system,

complete with support tower, rotation mechanism and controller. Many options exist within the turnkey system such as

height and type of tower, rotator mechanism, and controller type. As pictured above and originally supplied to NASA at

Edwards air Force Base in Edwards California, the tower was a special, massive, motorized, self supporting 72 foot tower

supplied by US tower Corp to M2specifications. The 6-30LP11 is the latest Log to join the M2Family of high quality broad

band antennas.

SPECIFICATIONS:

*Subtract 2.14 from dBi for dBd

BEFORE YOU BEGIN: Look over the ELEMENT ASSEMBLY sheets to get familiar with the various

parts of the log periodic. These written instructions attempt to give some order and efficiency to the

overall assembly and make you aware of critical areas. TWO CUPS OF ZINC PASTE HAS BEEN

PROVIDED AND SHOULD BE USED AT EACH JOINT WHERE MACHINED PARTS JOIN

ALUMINUM RODS OR TUBES AND GENERALLY AT EACH ELECTRICAL CONNECTION POINT.

WE ALSO STRONGLY RECOMMEND THAT EACH BOLT AND SCREW USED, BE TOUCHED IN

THIS PASTE WITH THE FIRST FEW THREADS. THIS WILL PREVENT GAULING AND BETTER

TIGHTENING OF THE STAINLESS HARDWARE.

THIS IS A VERY LARGE ANTENNA WHEN COMPLETELY ASSEMBLED. WE SUGGEST YOU

ASSEMBLE THE ELEMENTS FIRST AND WHEN DOING THE LARGER ELEMENTS, ASSEMBLE

THE TIP SECTIONS UP TO THE 1-1/2” SECTIONS, MARK AND SET ASIDE UNTIL THE BOOM IS

ASSEMBLED AND THE INNER SECTIONS 2” DIAMETER AND LARGER ARE MOUNTED ON

THE BOOM.

THE LONGEST 3 ELEMENTS ARE BOXED INDIVIDUALLY TO MAKE IT EASIER TO IDENTIFY

AND ASSEMBLE THE CORRECT ELEMENT SECTIONS.

BEGIN ASSEMBLING THE SMALLEST ELEMENTS FIRST TO ESTABLISH A “ROUTINE”

REFER TO THE ELEMENT 4 THOUGH 11 ASSEMBLY SHEET

1. Locate five (5) 7/8 x 30” FIBERGLASS RODS and (10) POLY DISCS with 7/8” holes. Press a

disc onto the end of a rod and slide it down until it is about 3/4” inside the INNER two 1/4” holes.

Then slide another poly disc on from the other end of the rod and position it about 3/4” inside the

other 1/4” hole. Repeat this for all five of the 7/8” FIBERGLASS RODS. Slight repositioning of the

poly discs may be required when the element is mounted below the boom.

ELEMENT #11 (Smallest)

2. Install a PHASE LINE CLAMP with 1” hole at the butt of the 1” x 60.75” element half with the two

grooves facing the butt. Secure the clamp block temporarily using an 8-32 x 1-1/2” screw and

locknut. Add a PHASING LINE CLAMP CAP to the PHASE LINE CLAMP using a 1/4-20 x 1” flat

head bolt and locknut, but finger tighten only at this time. Repeat for the other #11 element half.

Now slide each element half onto a previously prepared 7/8” FIBERGLASS ROD and align the

holes. Secure with 1/4-20 x 1-1/2" bolt and locknut. Finally, align the grooved side of the clamp

block assembly on each side with the NUT SIDE of the bolt holding each element half onto the

rod. Position the clamp blocks about 1/2” from the end of the element butts and tighten the 8-32 x

1-1/2” screws and locknuts securing the clamp blocks. Use a marking pen to identify the element

as #11. Element #11 is now complete and ready to be installed on the boom at a later time.

ELEMENTS #10, #9, #8, & #7

3. These are very similar to #11. Follow the same procedure as in step #2. Follow the ELEMENT

ASSEMBLY SHEET for the element information and the hardware needed. Don’t forget to use

PENETROX (ZINC) PASTE on all aluminum joints and on the threads of the screws and bolts.

Element #7 has a 1-1/8” outer sleeve but it still uses a 7/8” FIBERGLASS ROD and a PHASE

LINE CLAMP with 1” hole for the phasing lines.

6-30LP11 ASSEMBLY MANUAL

4. Element #6 is similar as well but has internal sleeves to strengthen the element. It has a 1-1/4”

diameter element butt and needs a 1” FIBERGLASS ROD, POLY DISCS with 1” hole and

PHASE LINE CLAMPS with 1-1/4” hole.

5. ELEMENT #5 is 1-1/2” diameter at the butt and needs a 1-1/4” FIBERGLASS ROD, POLY

DISCS with 1-1/4” hole and PHASE LINE CLAMPS with 1-1/2” hole.

6. ELEMENT #4 is similar to #5 but requires a 1-5/8” OUTSIDE SLEEVE over the butt section to

maintain element strength to survive 125 mph winds. ELEMENT #4 is unique because at #4

there is transition in phasing line diameter. Both PHASE LINE CLAMPS AND 3/8” CLAMP

BLOCK PAIRS are required at the butt of this element. The 3/8” diameter phasing lines go back

to element #3.

THIS COMPLETES ELEMENT ASSEMBLY FOR ELEMENTS #11

DOWN THROUGH ELEMENT #4

ELEMENTS #3, #2 AND #1 ARE NEXT AND WE RECOMMEND YOU ASSEMBLE THE OUTER

SECTIONS BEGINNING WITH THE 1-1/2” SECTIONS, MARK THEM AND SET THEM ASIDE FOR

LATER CONNECTION TO THEIR INNER SECTIONS.

6-30LP11 ASSEMBLY MANUAL

7. Assemble the three inner section of ELEMENT #3. NOTE that the PHASE LINE CLAMPS and

PHASING LINE CLAMP CAPS have been replaced with pairs of 3/8” CLAMP BLOCKS held in

place with the same bolt that keeps the element on the 2” FIBERGLASS ROD. These 3/8”

CLAMP BLOCKS clamp the 3/8” diameter phasing lines installed later in the assembly. The

POLY DISCS have 2” diameter holes to fit over the 2” center support insulator and may have

been factory installed as have the machined coupling rings. If POLY DISCS have not been fac-

tory installed on CENTER SUPPORT INSULATOR you will have to remove two rings off one

side, slide POLY DISCS on and re-install rings. NOTE: These POLY DISCS provide a long

barrier between the “hot” element and the grounded tower boom. They provide arc and flashover

protection in the event the insulator is contaminated with salt spray, bird doo or other foreign

substances that could conduct under the right condition.

8. Assembling ELEMENT #2 & #1 is similar to #3 except ELEMENT #2 & #1 each use (2)

ELEMENT SIDE SUPPORT BRACKETS that are attached to the 2” sections just inside the

SWAGED (necked down) section. Use a 2” U-bolt and cradle and stainless nuts and lock

washers. Attach (3) HPTG 1200 Philistran insulated cables to each of the three holes in ELE-

MENT SIDE SUPPORT BRACKET. Use a 3/16” cable eye in each hole. String two 1/8” cable

clips on one end of each cable and thread the cable end through each hole and around each

cable eye. Thread the cable end back through the cable clips about 3”. Space the clips about 1”

inch apart. Push one clip tight against the cable eye and begin tightening that clip. Strighten the

cable between the clips and begin tightening the second clip. Alternate back and forth on the

tightening of each clip until each is tight and the clips are secure. The other ends of these cable

will be attached to the TOWER BOOM and ELEMENT VERTICAL SUPPORT MAST later in the

assembly procedure.

6-30LP11 ASSEMBLY MANUAL

1. Use 1/2-13 X 2” (grade 5) galvanized bolts, 1/2-13 galvanized nut & 1/2-13 galvanized pal nut

for all tower boom section joints.

2. Shims (as shown) are supplied with tower sections to help align. Use as needed.

6-30LP11 BOOM TOWERASSEMBLY

6-30LP11 ELEMENT ASSEMBLY #4-11

6-30LP11 ELEMENT ASSEMBLY #3

6-30LP11 ELEMENT ASSEMBLY #2

6-30LP11 ELEMENT ASSEMBLY #1

1. Begin by installing element #11, the smallest element. Locate the bag of twenty (20) HD CRA-

DLES with 7/8” radius to fit the 7/8” fiberglass rods. These cradles have clearance holes for 5/16”

diameter bolts. Drop four (4) 5/16-24 x 4” bolts down through the element #11 mounting plate.

Hold the center of element #11 up near the plate and place two saddles on the center of 7/8” fi-

berglass rod. Raise the element up and feed the bolts down through the cradles. Place another

cradle under each upper cradle and add locknuts. Tighten up the nuts until the element is almost

secure. Then center the element through the cradles and rotate the element until the bolts at the

element butt are up and their corresponding nuts are down. Tighten the cradle bolts evenly and

completely. Now orient the PHASE LINE CLAMP ASSEMBLIES on the element butts so the

PHASING LINE CLAMP CAP are DOWN and square with the boom.

2. Continue mounting element #10, #9, #8, and #7 in order as described above.

3. Element #6 is different only as it has a 1” fiberglass rod and (4) HD CRADLES with 1” radius, fit-

ting the fiberglasss rod perfectly. Use (4) 5/16-24 x 4” bolts and locknuts to secure the element.

4. Element #5 and #4 both use 1-1/4” fiberglass rods and (4) HD CRADLES with 1-1/4” radius.

Use 5/16-24 x 4-1/2” bolts and locknuts.

5. Because of their size and weight we have suggested that just the INNER SECTIONS of element

#3, #2, and #1 be mounted before the whole element is assembled. Element #3 and #2 use 2”

fiberglass rods and (4) HD CRADLE with 2” radius. These cradles require 3/8-24 x 5” bolts and

locknuts. Before tightening cradles completely be sure to rotate the element so the 3/8” PHASE

LINE CLAMP CAPS are down and their bolts are perfectly perpendicular with the TOWER

BOOM legs. Doing this will facilitate the installation of the phasing lines in the subsequent as-

sembly steps.

6. Element #1 uses a 2” fiberglass rod and (8) HD CRADLES with 2” radius. These cradles require

(8) 3/8-24 x 5” bolts and locknuts. Again center and rotate the element in the cradles so the 3/8”

PHASE LINE CLAMP CAPS are down and their bolts perpendicular to the TOWER BOOM legs.

7. OPTIONAL: THE TIP SECTION OF ELEMENTS #3, #2, AND #1 CAN NOW BE INSTALLED.

You may also elect to do the element tip installation just prior to the antenna being place on a

tower. If you do it now or later, refer again to the appropriate element assembly sheet for the

hardware required to attach the tip sections.

8. Now do the final check and tightening of the all elements forward to the Element #11. TIGHTEN

each bottom cradle EVENLY AND SECURELY.

6-30LP11 ELEMENT INSTALLATION

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